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annotate lphobos/std/random.d @ 650:aa6a0b7968f7

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Added test case for bug #100 Removed dubious check for not emitting static private global in other modules without access. This should be handled properly somewhere else, it's causing unresolved global errors for stuff that should work (in MiniD)
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Sun, 05 Oct 2008 17:28:15 +0200
parents 373489eeaf90
children 88e23f8c2354
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473
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1 /**
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2 * Macros:
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3 * WIKI = Phobos/StdRandom
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4 */
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5
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6 // random.d
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7 // www.digitalmars.com
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8
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9 /* NOTE: This file has been patched from the original DMD distribution to
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10 work with the GDC compiler.
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11
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12 Modified by David Friedman, September 2007
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13 */
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14
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15 module std.random;
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16
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17 // Segments of the code in this file Copyright (c) 1997 by Rick Booth
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18 // From "Inner Loops" by Rick Booth, Addison-Wesley
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19
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20 version (Win32)
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21 {
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22 extern(Windows) int QueryPerformanceCounter(ulong *count);
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23 }
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24 else version (Unix)
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25 {
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26 version(linux) import std.c.linux.linux;
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27 else private import std.c.unix.unix;
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28 }
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29
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30 /* ===================== Random ========================= */
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31
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32 // BUG: not multithreaded
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33
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34 private uint seed; // starting seed
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35 private uint index; // ith random number
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36
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37 /**
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38 * The random number generator is seeded at program startup with a random value.
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39 This ensures that each program generates a different sequence of random
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40 numbers. To generate a repeatable sequence, use rand_seed() to start the
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41 sequence. seed and index start it, and each successive value increments index.
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42 This means that the $(I n)th random number of the sequence can be directly
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43 generated
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44 by passing index + $(I n) to rand_seed().
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45
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46 Note: This is more random, but slower, than C's rand() function.
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47 To use C's rand() instead, import std.c.stdlib.
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48 */
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49
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50 void rand_seed(uint seed, uint index)
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51 {
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52 .seed = seed;
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53 .index = index;
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54 }
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55
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56 /**
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57 * Get the next random number in sequence.
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58 * BUGS: shares a global single state, not multithreaded
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59 */
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60
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61 uint rand()
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62 {
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63 static uint xormix1[20] =
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64 [
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65 0xbaa96887, 0x1e17d32c, 0x03bcdc3c, 0x0f33d1b2,
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66 0x76a6491d, 0xc570d85d, 0xe382b1e3, 0x78db4362,
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67 0x7439a9d4, 0x9cea8ac5, 0x89537c5c, 0x2588f55d,
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68 0x415b5e1d, 0x216e3d95, 0x85c662e7, 0x5e8ab368,
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69 0x3ea5cc8c, 0xd26a0f74, 0xf3a9222b, 0x48aad7e4
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70 ];
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71
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72 static uint xormix2[20] =
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73 [
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74 0x4b0f3b58, 0xe874f0c3, 0x6955c5a6, 0x55a7ca46,
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75 0x4d9a9d86, 0xfe28a195, 0xb1ca7865, 0x6b235751,
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76 0x9a997a61, 0xaa6e95c8, 0xaaa98ee1, 0x5af9154c,
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77 0xfc8e2263, 0x390f5e8c, 0x58ffd802, 0xac0a5eba,
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78 0xac4874f6, 0xa9df0913, 0x86be4c74, 0xed2c123b
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79 ];
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80
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81 uint hiword, loword, hihold, temp, itmpl, itmph, i;
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82
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83 loword = seed;
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84 hiword = index++;
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85 for (i = 0; i < 4; i++) // loop limit can be 2..20, we choose 4
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86 {
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87 hihold = hiword; // save hiword for later
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88 temp = hihold ^ xormix1[i]; // mix up bits of hiword
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89 itmpl = temp & 0xffff; // decompose to hi & lo
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90 itmph = temp >> 16; // 16-bit words
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91 temp = itmpl * itmpl + ~(itmph * itmph); // do a multiplicative mix
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92 temp = (temp >> 16) | (temp << 16); // swap hi and lo halves
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93 hiword = loword ^ ((temp ^ xormix2[i]) + itmpl * itmph); //loword mix
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94 loword = hihold; // old hiword is loword
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95 }
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96 return hiword;
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97 }
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98
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99 static this()
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100 {
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101 ulong s;
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102
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103 version(Win32)
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104 {
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105 QueryPerformanceCounter(&s);
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106 }
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107 else version(Unix)
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108 {
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109 // time.h
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110 // sys/time.h
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111
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112 timeval tv;
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113
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114 if (gettimeofday(&tv, null))
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115 { // Some error happened - try time() instead
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116 s = time(null);
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117 }
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118 else
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119 {
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120 s = cast(ulong)((cast(long)tv.tv_sec << 32) + tv.tv_usec);
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121 }
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122 }
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123 else version(NoSystem)
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124 {
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125 // nothing
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126 }
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127 else
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128 static assert(false);
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129 rand_seed(cast(uint) s, cast(uint)(s >> 32));
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130 }
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131
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132
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133 unittest
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134 {
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135 static uint results[10] =
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136 [
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137 0x8c0188cb,
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138 0xb161200c,
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139 0xfc904ac5,
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140 0x2702e049,
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141 0x9705a923,
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142 0x1c139d89,
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143 0x346b6d1f,
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144 0xf8c33e32,
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145 0xdb9fef76,
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146 0xa97fcb3f
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147 ];
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148 int i;
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149 uint seedsave = seed;
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150 uint indexsave = index;
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151
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152 rand_seed(1234, 5678);
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153 for (i = 0; i < 10; i++)
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154 { uint r = rand();
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155 //printf("0x%x,\n", rand());
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156 assert(r == results[i]);
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157 }
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158
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159 seed = seedsave;
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160 index = indexsave;
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161 }